JAKARTA, NETRALNEWS.COM - Astronauts and scientists have concluded that a planet with mass 10 times larger than Earth is projected to have a radius of 3.66 Earth radii and a temperature of minus 375 degrees Fahrenheit.
Two scientists from the University of Bern, Prof Christoph Mordasini and Esther Linder, estimated that "Planet Nine" is a smaller version of Uranus and Neptune, with a surface temperature of minus 375 degrees.
"For me the Planet Nine candidate is the closest object, although it is about 700 times farther between Earth and the Sun," said Linder, as quoted from Natgeo on Sunday (11/12/2017).
Scientists assume that the planet is a small ice giant with a surface covered by hydrogen and helium.
They calculate how many parameters such as planetary radius or brightness over time since the solar system formed 4.6 billion years ago with an evolutionary model.
They concluded that a planet with 10 Earth masses is projected to have a radius of 3.66 Earth radii and a temperature of minus 375 degrees Fahrenheit.
"This means that planetary emissions are dominated by core cooling, if temperatures will only be 10 Kelvins," says Linder.
Its intrinsic strength is about 1,000 times greater than the absorbed power. Therefore, reflected sunlight contributes only a fraction of the total detectable radiation. It also means that Planet Nine is brighter in infrared than in visual.
"Through our study, Planet candidates to Nine now have more than a simple point mass, it is shaped and has physical properties," Mordasini said.